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Generate a random point within a circle (uniformly)
...gle we just fold any points that appear in ADC back down to ABC along AC.
Now consider a circle. In the limit we can think of it as infinitely many isoceles triangles ABC with B at the origin and A and C on the circumference vanishingly close to each other. We can pick one of these triangles simply...
How can I change the version of npm using nvm?
...nce this question was first answered, as noted in a newer answer, there is now a command for this:
nvm now has a command to update npm. It's nvm install-latest-npm or nvm install --latest-npm.
nvm install-latest-npm: Attempt to upgrade to the latest working npm on the current node version
nvm...
“Unknown provider: aProvider
...
I'd still love to know how I could have found the place in our source code that caused this issue, but I have since been able to find the problem manually.
There was a controller function declared on the global scope, instead of using a .contr...
How to index into a dictionary?
...f anybody still looking at this question, the currently accepted answer is now outdated:
Since Python 3.7* the dictionaries are order-preserving, that is they now behave exactly as collections.OrderedDicts used to. Unfortunately, there is still no dedicated method to index into keys() / values() of...
How to play with Control.Monad.Writer in haskell?
...Writer
ghci> let logNumber x = writer (x, ["Got number: " ++ show x])
Now logNumber is a function that creates writers. I can ask for its type:
ghci> :t logNumber
logNumber :: (Show a, MonadWriter [String] m) => a -> m a
Which tells me that the inferred type is not a function that r...
How do you performance test JavaScript code?
...and easy to use, as are console.time(), console.profile(), and performance.now(). Chrome also gives you a timeline view which can show you what is killing your frame rate, where the user might be waiting, etc.
Finding documentation for all these tools is really easy, you don't need an SO answer for...
What is the difference between shallow copy, deepcopy and normal assignment operation?
...llow copy:
d = copy.copy(c)
print id(c) == id(d) # False - d is now a new object
print id(c[0]) == id(d[0]) # True - d[0] is the same object as c[0]
Using a deep copy:
d = copy.deepcopy(c)
print id(c) == id(d) # False - d is now a new object
print id(c[0]) == id(d[0]) #...
JavaScript: Is there a way to get Chrome to break on all errors?
...
Edit: The original link I answered with is now invalid.The newer URL would be https://developers.google.com/web/tools/chrome-devtools/javascript/add-breakpoints#exceptions as of 2016-11-11.
I realize this question has an answer, but it's no longer accurate. Use the l...
How do you get the current time of day?
...
DateTime.Now.TimeOfDay gives it to you as a TimeSpan (from midnight).
DateTime.Now.ToString("h:mm:ss tt") gives it to you as a string.
DateTime reference: https://msdn.microsoft.com/en-us/library/system.datetime
...
Using node.js as a simple web server
...
Simplest Node.js server is just:
$ npm install http-server -g
Now you can run a server via the following commands:
$ cd MyApp
$ http-server
If you're using NPM 5.2.0 or newer, you can use http-server without installing it with npx. This isn't recommended for use in production but ...